用pathon写一个贪吃蛇

好的，以下是一个简单的 Python 贪吃蛇游戏的代码实现（基于 Pygame 库）：

import pygame
import random

# 初始化 Pygame 库
pygame.init()

# 游戏区域大小
width = 500
height = 500

# 设置游戏窗口
screen = pygame.display.set_mode((width, height))
pygame.display.set_caption("贪吃蛇游戏")

# 定义颜色
white = (255, 255, 255)
black = (0, 0, 0)
green = (0, 255, 0)
red = (255, 0, 0)

# 定义蛇的初始位置和大小
snake_x = 250
snake_y = 250
snake_w = 10
snake_h = 10
snake_speed = 10

# 定义食物的初始位置和大小
food_x = random.randint(0, width - snake_w)
food_y = random.randint(0, height - snake_h)
food_w = 10
food_h = 10

# 定义蛇的移动方向
snake_direction = 'right'

# 定义蛇的身体
snake_body = []
snake_length = 1

# 定义字体
font = pygame.font.Font(None, 30)

# 定义游戏结束函数
def game_over():
    text = font.render("游戏结束！", True, red)
    screen.blit(text, (width / 2 - 80, height / 2 - 15))
    pygame.display.update()
    pygame.time.delay(2000)
    pygame.quit()
    quit()

# 游戏循环
while True:
    # 处理事件
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            quit()
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_UP and snake_direction != 'down':
                snake_direction = 'up'
            elif event.key == pygame.K_DOWN and snake_direction != 'up':
                snake_direction = 'down'
            elif event.key == pygame.K_LEFT and snake_direction != 'right':
                snake_direction = 'left'
            elif event.key == pygame.K_RIGHT and snake_direction != 'left':
                snake_direction = 'right'

    # 移动蛇
    if snake_direction == 'up':
        snake_y -= snake_speed
    elif snake_direction == 'down':
        snake_y += snake_speed
    elif snake_direction == 'left':
        snake_x -= snake_speed
    elif snake_direction == 'right':
        snake_x += snake_speed

    # 判断是否吃到食物
    if snake_x < food_x + food_w and snake_x + snake_w > food_x and snake_y < food_y + food_h and snake_y + snake_h > food_y:
        food_x = random.randint(0, width - snake_w)
        food_y = random.randint(0, height - snake_h)
        snake_length += 1

    # 更新蛇的身体
    snake_head = []
    snake_head.append(snake_x)
    snake_head.append(snake_y)
    snake_body.append(snake_head)
    if len(snake_body) > snake_length:
        del snake_body[0]

    # 判断是否撞墙
    if snake_x < 0 or snake_x > width - snake_w or snake_y < 0 or snake_y > height - snake_h:
        game_over()

    # 判断是否撞到自己
    for block in snake_body[:-1]:
        if block == snake_head:
            game_over()

    # 绘制游戏界面
    screen.fill(white)
    pygame.draw.rect(screen, green, [food_x, food_y, food_w, food_h])
    for block in snake_body:
        pygame.draw.rect(screen, black, [block[0], block[1], snake_w, snake_h])
    pygame.display.update()
    pygame.time.delay(100)

这个代码实现了一个简单的贪吃蛇游戏，玩家可以通过方向键控制蛇的移动方向，吃到食物后蛇的身体长度会增加，如果蛇撞墙或者撞到自己，则游戏结束。